loading posts via ajax and jquery in wordpress -

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i'm using jquery , php previous post blog roll. i'm loading 1 post @ time on page , clicking previous post link trigger ajax call. end result similar how medium.com pulls next post article. below code works, somewhat, however, keeps looping , returning null value when come last post.

here's jquery part

loadnextpost : function( callback ) {       $this = this;       $.ajax( {         type: "post",        url: '/wp-admin/admin-ajax.php',         data: {           action: 'get_prev_post',           current_url: location.href,           nonce: mediumjs.nonce,         }       } )       .done( function( post ) {         if( '' !== post ) {           $this.nextpost = json.parse( post );         } else {           $this.nextpost = null;         }         callback.call( $this );       } );     },

now php function

function get_prev_post() {  global $post;     $thispost = url_to_postid($_post['current_url']);      if ( isset($thispost) ){     $id = (int) $thispost;     $post = get_post( $id );     $attachment_url = wp_get_attachment_url( get_post_thumbnail_id( $previous_post->id ) );     $previous_post = get_previous_post();     //header( "content-type: application/json" );     $array = array('post_id' => $previous_post->id,'post_content'=> $previous_post->post_content,  'post_title' => $previous_post->post_name,  'permalink' => get_permalink($previous_post->id), 'attachment_url' => wp_get_attachment_url( get_post_thumbnail_id( $previous_post->id )  ));     }      echo json_encode($array);      //print_r($thispost);   die();   }


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